wp_script_is() and wp_style_is() should use 'enqueued' so it reads like a sentence

Description

wp_script_is( $handle, $list = 'queue' ) reads like "Is the script queue?" Another parameter for $list is 'registered', "Is the script registered?" Given that the function is wp_enqueue_script(), we should allow for $list = 'enqueued', as in "Is the script enqueued?" Same goes for wp_style_is().